EP1753748B1 - Proline derivatives and their use as dipeptidyl peptidase iv inhibitors - Google Patents

Proline derivatives and their use as dipeptidyl peptidase iv inhibitors Download PDF

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EP1753748B1
EP1753748B1 EP05733750A EP05733750A EP1753748B1 EP 1753748 B1 EP1753748 B1 EP 1753748B1 EP 05733750 A EP05733750 A EP 05733750A EP 05733750 A EP05733750 A EP 05733750A EP 1753748 B1 EP1753748 B1 EP 1753748B1
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compound
pharmaceutically acceptable
inhibitors
mmol
syndrome
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German (de)
English (en)
French (fr)
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EP1753748A1 (en
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Bernard Hulin
David Walter Piotrowski
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Pfizer Products Inc
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Pfizer Products Inc
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Priority to PL05733750T priority Critical patent/PL1753748T3/pl
Priority to SI200530767T priority patent/SI1753748T1/sl
Priority to EP09166645.3A priority patent/EP2116541B1/en
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Definitions

  • the invention relates to selective inhibitors of the enzyme dipeptidyl peptidase-IV (DPP-IV), pharmaceutical compositions thereof, and uses thereof for treating diseases and conditions associated with proteins that are subject to processing by DPP-IV.
  • DPP-IV dipeptidyl peptidase-IV
  • DPP-IV (EC 3.4.14.5) is a serine protease that preferentially hydrolyzes an N-terminal dipeptide from proteins having proline or alanine in the 2-position. DPP-IV is believed to be involved in diabetes, glucose tolerance, obesity, appetite regulation, lipidemia, osteoporosis, neuropeptide metabolism and T-cell activation, among others. Accordingly, administration of DPP-IV inhibitors in vivo prevents N-terminal degradation of substrate peptides, thereby resulting in higher circulating concentrations of such peptides, and therapeutic benefits associated with such elevated concentrations.
  • DPP-IV has been implicated in the control of glucose homeostasis because its substrates include the incretin peptides glucagon-like peptide 1 (GLP-1) and gastric inhibitory polypeptide (GIP). Cleavage of the N-terminal amino acids from these peptides renders them functionally inactive.
  • GLP-1 has been shown to be an effective anti-diabetic therapy in Type 2 diabetic patients and to reduce the meal-related insulin requirement in Type 1 diabetic patients.
  • GLP-1 and/or GIP are believed to regulate satiety, lipidemia and osteogenesis.
  • Exogenous GLP-1 has been proposed as a treatment for patients suffering from acute coronary syndrome, angina and ischemic heart disease.
  • DPP-IV inhibitors in vivo prevents N-terminal degradation of GLP-1 and GIP, resulting in higher circulating concentrations of these peptides, increased insulin secretion and improved glucose tolerance.
  • DPP-IV inhibitors are regarded as agents for the treatment of Type 2 diabetes, a disease in which glucose tolerance is impaired.
  • treatment with DPP-IV inhibitors prevents degradation of Neuropeptide Y (NPY), a peptide associated with a variety of central nervous system disorders, and Peptide YY which has been linked to gastrointestinal conditions such as ulcers, irritable bowel disease, and inflammatory bowel disease.
  • NPY Neuropeptide Y
  • Peptide YY which has been linked to gastrointestinal conditions such as ulcers, irritable bowel disease, and inflammatory bowel disease.
  • Treatment of Type 2 diabetes usually comprises a combination of diet, exercise, oral agents, and In more severe cases, insulin.
  • the clinically available hypoglycemics can have side effects that limit their use.
  • Type 2 diabetes is a direct cause of the multiplicity of complications (cataracts, neuropathy, nephropathy, retinopathy, cardiomyopathy) that characterize advanced Type 2 diabetes.
  • Type 2 diabetes is a comorbid disease that frequently confounds hyperlipidemia, atherosclerosis and hypertension, adding significantly to the overall morbidity and mortality attributable to those diseases.
  • CVD cardiovascular disease
  • Hypertension is a condition that can occur in many patients in whom the causative agent or disorder is unknown. Such "essential" hypertension is often associated with disorders such as obesity, diabetes, and hypertriglyceridemia and it is known that hypertension is positively associated with heart failure, renal failure, and stroke. Hypertension can also contribute to the development of atherosclerosis and coronary disease. Hypertension, together with insulin resistance and hyperlipidemia, comprise the constellation of symptoms that characterize metabolic syndrome, also known as insulin resistance syndrome (IRS) and Syndrome X.
  • IRS insulin resistance syndrome
  • Obesity is a well-known and common risk factor for the development of atherosclerosis, hypertension, and diabetes. The incidence of obesity and its related sequelae is increasing worldwide. Currently, few pharmacological agents are available that reduce adiposity effectively and acceptably.
  • Osteoporosis is a progressive systemic disease characterized by low bone density and microarchitectural deterioration of bone tissue, with a consequent increase in bone fragility and susceptibility to fracture. Osteoporosis and the consequences of compromised bone strength are a significant cause of frailty, and of increased morbidity and mortality.
  • Heart disease is a major health problem throughout the world. Myocardial infarctions are a significant source of mortality among those individuals with heart disease. Acute coronary syndrome denotes patients who have or are at high risk of developing an acute myocardial infarction (MI).
  • MI myocardial infarction
  • DPP-IV inhibitors are discussed in Augustyns, et al., Curr. Medicinal Chem., 6, 311 (1999 ); Ohnuki, et al., Drugs of the Future, 1999, 24, 665-670 (1999 ); Villhauer, et al., Annual Reports in Medicinal Chemistry, 36, 191-200 (2001 ); Drucker, Expert Opin. Invest. Drugs, 12, 87-100 (2003 ); and Weideman, et al., Curr. Opin. Invest. Drugs, 4, 412-420 (2003 ).
  • Orally administered compounds that inhibit DPP-IV have recently been prepared, such as those disclosed in International Application WO 02/14271 .
  • DPP-IV inhibitors such as those disclosed in WO 02/14271 , are believed to act by inhibiting the degradation of the natural hormones, GLP-1 and GIP. Therefore, it is important that a suitable concentration of the DPP-IV inhibitor be available in plasma to inhibit DPP-IV coincidently with the secretion of these GLP-1 and GIP hormones. To achieve such plasma concentrations, it is preferred that the DPP-IV inhibitor compounds maintain a higher plasma concentration over time than that which would be expected for other DPP-IV inhibitor compounds, such as those disclosed in WO 02/14271 .
  • WO03/00250 describes 3-fluoro pyrrolidines and WO2005/019168 describes fluorinated lysine derivatives that are DPP-IV inhibitors.
  • the present invention relates to a compound which is (3,3-Difluoropyrrolidin-1-yl)-((2S,4S)-4-(4-(pyrimidin-2-yl)piperazin-1-yl)pyrrolidin-2-yl)methanone, or a pharmaceutically acceptable salt thereof.
  • the present invention also relates to a pharmaceutical composition
  • a pharmaceutical composition comprising:
  • the present invention further relates to the compound of the invention or a pharmaceutically acceptable salt thereof, for use in treating a condition mediated by dipeptidyl peptidase-IV in a mammal.
  • the present invention additionally relates to the use of a compound of the invention or a pharmaceutically acceptable salt thereof for the manufacture of a medicament for treating a condition mediated by dipeptidyl peptidase-IV in a mammal.
  • the compound, and pharmaceutical composition, of the present invention are useful for the treatment of diabetes, preferably Type 2 diabetes.
  • the compound, and pharmaceutical composition, of the present invention are also useful for the treatment of dipeptidyl peptidase-IV related conditions which include, but are not limited to, Type 2 diabetes; Type 1 diabetes, impaired glucose tolerance, hyperglycemia, metabolic syndrome (syndrome X and/or insulin resistance syndrome), glucosuria, metabolic acidosis, arthritis, cataracts, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, diabetic cardiomyopathy, obesity, conditions exacerbated by obesity, hypertension, hyperlipidemia, atherosclerosis, osteoporosis, osteopenia, frailty, bone loss, bone fracture, acute coronary syndrome, short stature due to growth hormone deficiency, infertility due to polycystic ovary syndrome, anxiety, depression, insomnia, chronic fatigue, epilepsy, eating disorders, chronic pain, alcohol addiction, diseases associated with intestinal motility, ulcers, irritable bowel syndrome, inflammatory bowel syndrome; short bowel syndrome; and the prevention of disease progression in Type 2 diabetes.
  • phrases "pharmaceutically acceptable” indicates that the designated carrier, vehicle, diluent, excipient(s), and/or salt is generally chemically and/or physically compatible with the other ingredients comprising the formulation, and physiologically compatible with the recipient thereof.
  • the carbon atom content of the various hydrocarbon-containing moieties herein may be indicated by a prefix designating the minimum and maximum number of carbon atoms in the moiety, for example, the prefixes (C a -C b )alkyl, and C a - b alkyl, indicate an alkyl moiety of the integer "a" to "b" carbon atoms, inclusive.
  • (C 1 -C 6 )alkyl and C 1-6 alkyl refer to an alkyl group of one to six carbon atoms inclusive.
  • alkyl denotes a straight or branched chain of carbon atoms, wherein the alkyl group optionally incorporates one or more double or triple bonds, or a combination of double bonds and triple bonds.
  • alkyl groups include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, vinyl, allyl, 2-methylpropenyl, 2-butenyl, 1,3-butadienyl, ethynyl, propargyl, and the like.
  • alkoxy refers to straight or branched, monovalent, saturated aliphatic chains of carbon atoms bonded to an oxygen atom that is attached to a core structure.
  • alkoxy groups include methoxy, ethoxy, propoxy, butoxy, iso-butoxy, tert -butoxy, and the like.
  • cycloalkyl denotes a saturated monocyclic or bicyclic cycloalkyl group. Cycloalkyl groups may be optionally fused to aromatic hydrocarbons such as benzene to form fused cycloalkyl groups, such as indanyl and the like. Examples of cycloalkyl groups include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, and the like.
  • halogen or "halo” represents chloro, bromo, fluoro, and iodo atoms and substituents.
  • aryl denotes a monocyclic or polycyclic aromatic hydrocarbon group, for example, anthracenyl, fluorenyl, naphthyl, phenanthrenyl, phenyl, and the like.
  • arylalkyl means an alkyl group, as defined hereinabove, wherein at least one of the hydrogen atoms thereof has been substituted with an aryl group, also as defined hereinabove.
  • arylalkyl groups include, inter alia, benzyl groups.
  • heterocycloalkyl refers to a saturated four- to eight-membered heterocyclic ring system, optionally fused to a five- or six-membered aromatic or heteroaromatic ring system.
  • heterocycloalkyl groups comprise homopiperazinyl, piperazinyl, piperidyl, pyrrolidinyl, azetidinyl, 2-aza-bicyclo[2.2.1]heptanyl, 3-aza-bicyclo[3.1.0]hexanyl, 2,5-diaza-bicyclo[2.2.1]heptanyl, 5,6,7,8-tetrahydro-2H-imidazo[1,2-a]pyrazinyl, 5.6,7,8-tetrahydro[1,2,4]triazolo[4,3-a]pyrazinyl, 4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazinyl, 5,6,7,8-tetrahydropyrido[3,4-d]pyrimidyl, 5,6,7,8-tetrahydropyrido[4,3-d]pyrimidyl, octahydropyrrolo[3,4-b]pyrrolyl
  • heteroaryl denotes a monocyclic or polycyclic aromatic heterocyclic ring system.
  • heteroaryl groups comprise benzoisothiazolyl, benzisoxazolyl, benzooxazolyl, benzothiazolyl, benzofuranyl, benzothienyl, benzimidazolyl, cinnolinyl, furanyl, furopyridyl, imidazolopyrimidyl, imidazolyl, indazolyl, indolyl, isoquinolyl, isothiazolyl, isoxadiazolyl, isoxazolyl, oxazolopyridyl, oxadiazolyl, oxazolyl, phthalazinyl, pteridinyl, pyrazinyl, pyridazinyl, pyrrolopyrimidyl, pyrrolopyridyl, pyrazolopyrimidyl, phthalazinyl
  • oxo means a carbonyl group formed by the combination of a carbon atom and an oxygen atom.
  • substituted means that a hydrogen atom on a molecule has been replaced with a different atom or molecule.
  • the atom or molecule replacing the hydrogen atom is denoted as a "substituent.”
  • inert solvent refers to a solvent, or mixture of solvents, that does not interact with starting materials, reagents, intermediates, or products in a manner that adversely affects their desired properties.
  • treating includes preventative (e.g., prophylactic), palliative, and curative uses or results.
  • terapéuticaally effective amount means an amount of a compound of the present invention that (i) treats or prevents the particular disease, condition, or disorder, (ii) attenuates, ameliorates, or eliminates one or more symptoms of the particular disease, condition, or disorder, or (iii) prevents or delays the onset of one or more symptoms of the particular disease, condition, or disorder described herein.
  • mammal is an individual animal that is a member of the taxonomic class Mammalia.
  • the class Mammalia includes, for example, humans, monkeys, chimpanzees, gorillas, cattle, swine, horses, sheep, dogs, cats, mice and rats.
  • the preferred mammal is a human.
  • the compounds of the present invention may be resolved into the pure enantiomers by methods known to those skilled in the art, for example by formation of diastereoisomeric salts which may be separated, for example, by crystallization; formation of diastereoisomeric derivatives or complexes which may be separated, for example, by crystallization, gas-liquid or liquid chromatography; selective reaction of one enantiomer with an enantiomer-specific reagent, for example enzymatic esterification; or gas-liquid or liquid chromatography in a chiral environment, for example on a chiral support for example silica with a bound chiral ligand or in the presence of a chiral solvent.
  • the desired stereoisomer is converted into another chemical entity by one of the separation procedures described above, a further step is required to liberate the desired enantiomeric form.
  • the specific stereoisomers may be synthesized by using an optically active starting material, by asymmetric synthesis using optically active reagents, substrates, catalysts or solvents, or by converting one stereoisomer into the other by asymmetric transformation.
  • intermediates in the course of the synthesis may exist as racemic mixtures and be subjected to resolution by methods known to those skilled in the art, for example by formation of diastereoisomeric salts which may be separated, for example, by crystallization; formation of diastereoisomeric derivatives or complexes which may be separated, for example, by crystallization, gas-liquid or liquid chromatography; selective reaction of one enantiomer with an enantiomer-specific reagent, for example enzymatic esterification; or gas-liquid or liquid chromatography in a chiral environment, for example on a chiral support for example silica with a bound chiral ligand or in the presence of a chiral solvent.
  • stereoisomer is converted into another chemical entity by one of the separation procedures described above, a further step is required to liberate the desired enantiomeric form.
  • specific stereoisomers may be synthesized by asymmetric synthesis using optically active reagents, substrates, catalysts or solvents, or by converting one stereoisomer into the other by asymmetric transformation.
  • Certain compounds may exist in different stable conformational forms which may be separable. Torsional asymmetry due to restricted rotation about an asymmetric single bond, for example because of steric hindrance or ring strain, may permit separation of different conformers.
  • the present invention includes each conformational isomer of the compound of the invention and mixtures thereof. Practitioners will appreciate that certain compounds may exist in tautomeric form, i.e., that an equilibrium exists between two isomers which are in rapid equilibrium with each other.
  • a common example of tautomerism is keto-enol tautomerism, i.e.,
  • hydroxypyridines examples include, inter alia, hydroxypyridines (pyridones) and hydroxypyrmidines (pyrimidones).
  • pyridones hydroxypyridines
  • pyrmidines pyrimidones
  • the compounds of the present invention may exist in unsolvated as well as solvated forms with pharmaceutically acceptable solvents such as water, ethanol, and the like, and it is intended that the invention embrace unsolvated forms, solvated forms and mixtures of solvated forms.
  • Polymorphs form part of this invention and may be prepared by crystallization of a compound of the invention under different conditions. For example, using different solvents or different solvent mixtures for recrystallization; crystallization at different temperatures; various modes of cooling, ranging from very fast to very slow cooling during crystallization. Polymorphs may also be obtained by heating or melting a compound of the invention followed by gradual or fast cooling. The presence of polymorphs may be determined by solid probe nmr spectroscopy, ir spectroscopy, differential scanning calorimetry, powder X-ray diffraction or such other techniques.
  • This invention also includes isotopically-labeled compounds, which are identical to that described, but for the fact that one or more atoms are replaced by an atom having an atomic mass or mass number different from the atomic mass or mass number usually found in nature.
  • isotopes that can be incorporated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, sulfur and fluorine, such as 2 H, 3 H, 13 C, 14 C, 15 N, 18 O, 17 O, 35 S, 38 Cl, 125 I, 129 I, and 18 F respectively.
  • isotopically labeled compounds of the compound of this invention and prodrugs thereof can generally be prepared by carrying out the procedures disclosed in the schemes and/or in the Examples below, by substituting a readily available isotopically labeled reagent for a non-isotopically labeled reagent.
  • Pharmaceutically acceptable salts include pharmaceutically acceptable inorganic and organic salts of said compound. These salts can be prepared in situ during the final isolation and purification of a compound, or by separately reacting the compound or prodrug with a suitable organic or inorganic acid and isolating the salt thus formed.
  • Representative salts include, but are not limited to, the hydrobromide, hydrochloride, hydroiodide, sulfate, bisulfate, nitrate, acetate, trifluoroacetate, oxalate, besylate, palmitate, pamoate, malonate, stearate, laurate, malate, borate, benzoate, lactate, phosphate, hexafluorophosphate, benzene sulfonate, tosylate, formate, citrate, maleate, fumarate, succinate, tartrate, naphthylate, mesylate, glucoheptonate, lactobionate and laurylsulphonate salts, and the like.
  • These may also include cations based on the alkali and alkaline earth metals, such as sodium, lithium, potassium, calcium, magnesium, and the like, as well as non-toxic ammonium, quaternary ammonium, and amine cations including, but not limited to, ammonium, tetramethylammonium, tetraethylammonium, methylamine, dimethylamine, trimethylamine,
  • the compounds of the present invention may be isolated and used per se or in the form of their pharmaceutically acceptable salts or solvates.
  • compounds with multiple basic nitrogen atoms can form salts with varying number of equivalents of acid. It will be understood by practitioners that all such salts are within the scope of the present invention.
  • a prodrug of a compound of the invention may be one formed in a conventional manner with a functional group of the compound, such as with an amino, hydroxy or carboxy group.
  • the term "prodrug” means a compound that is transformed in vivo to yield a compound of the invention or a pharmaceutically acceptable salt or solvate of the compound. The transformation may occur by various mechanisms, such as through hydrolysis, in blood.
  • a discussion of the use of prodrugs is provided by T. Higuchi and W. Stella, "Pro-drugs as Novel Delivery Systems," Vol. 14 of the A.C.S. Symposium Series, and in Bioreversible Carriers in Drug Design, ed. Edward B. Roche, American Pharmaceutical Association and Pergamon Press, 1987 .
  • a prodrug can be formed by the replacement of a hydrogen atom in the amine group with a group such as R-carbonyl, RO-carbonyl, NRR'-carbonyl where R and R' are each independently (C 1 -C 10 )alkyl, (C 3 -C 7 )cycloalkyl, benzyl, or R-carbonyl is a natural ⁇ -aminoacyl or natural ⁇ -aminoacyl-natural ⁇ -aminoacyl, -C(OH)C(O)OY' wherein Y' is H, (C 1 -C 6 )a)kyl or benzyl, -C(OY 0 )Y 1 wherein Y 0 is (C 1 -C 4 ) alkyl and Y 1 is (C 1 -C 6 )alkyl, carboxy(C 1 -C 6 )alkyl, amino(C 1
  • a prodrug can be formed by the replacement of the hydrogen atom of the alcohol group with a group such as (C 1 -C 6 )alkanoyloxymethyl, 1-((C 1 -C 6 )alkanoyloxy)ethyl, 1-methyl-1-((C 1 -C 6 )alkanoyloxy)ethyl, (C 1 -C 6 )alkoxycarbonyloxymethyl, N-(C 1 -C 6 )alkoxycarbonylaminomethyl, succinoyl, (C 1 -C 6 )alkanoyl, ⁇ -amino(C 1 -C 4 )alkanoyl, arylacyl and ⁇ -aminoacyl, or ⁇ -aminoacyl- ⁇ -aminoacyl, where each ⁇ -aminoacyl group is independently selected from the naturally occurring L-amino acids, P(O)(OH)
  • a prodrug can comprise an ester formed by the replacement of the hydrogen atom of the acid group with a group such as (C 1 -C 6 )alkyl, (C 2 -C 12 )alkanoyloxymethyl, 1-(alkanoyloxy)ethyl having from 4 to 9 carbon atoms, 1-methyl-1-(alkanoyloxy)-ethyl having from 5 to 10 carbon atoms, alkoxycarbonyloxymethyl having from 3 to 6 carbon atoms, 1-(alkoxycarbonyloxy)ethyl having from 4 to 7 carbon atoms, 1-methyl-1-(alkoxycarbonyloxy)ethyl having from 5 to 8 carbon atoms, N-(alkoxycarbonyl)aminomethyl having from 3 to 9 carbon atoms, 1-(N-(alkoxycarbonyl)amino)ethyl having from 4 to 10 carbon atoms, 3-phthalidy
  • the compound of this invention may be prepared by methods that include processes known in the chemical arts, particularly in light of the description contained herein. Certain processes for the manufacture of the compound of this invention are illustrated by the following reaction schemes. Other processes are described in the experimental section. The methods disclosed in the instant Schemes and Examples are are intended for purposes of exemplifying the instant invention, and are not to be construed in any manner as limitations thereon.
  • BOC tert -butoxycarbonyl
  • Cbz benzyloxycarbonyl
  • DMF N,N-dimethylformamide
  • NMP N-methyl-2-pyrrolidinone
  • DMAC N,N-dimethylacetamide
  • DME diimethoxyethane
  • DMSO dimethylsulfoxide
  • EtOAC ethyl acetate
  • EtOH ethanol
  • MeOH MeOH
  • TFA trifluoroacetic acid
  • TFAA trifluoroacetic anhydride
  • TEA triethylamine
  • THF tetrahydrofuran
  • DIPEA diisopropylethylamine
  • EDC 1-(3-dimethylaminopropyl)-3-carbodiimide
  • DCC dicyclohexylcarbodiimide
  • CDI 1,1'-carbonyldiimidazole
  • HATU O-
  • (II) is dissolved in TFA and, after a suitable time (e.g., about 30 min to about 24 hours), excess TFA is removed in vacuo, and the residual product is triturated with a solvent such as ether.
  • a suitable time e.g., about 30 min to about 24 hours
  • deprotection may be performed by hydrogenolysis in the presence of catalyst, such as 10% palladium or palladium hydroxide, in a suitable solvent such as EtOH or EtOAC at a pressure of about 30 psi to about 60 psi, for a sufficient period of time, usually overnight, at a temperature of between about 20° C and about 80° C.
  • hydrogenolysis is effected at a pressure of about 45 psi at room temperature.
  • the compounds of formula (II) may be prepared by coupling an appropriately-subtituted carboxylic acid derivative (III) with an appropriately-substituted amine derivative (IV) as depicted hereinbelow in Scheme 2.
  • the coupling is typically accomplished by combining (III) and (IV) in a reaction-lnert solvent, preferably an aprotic solvent such as acetonitrile, dichloromethane, DMF, THF, or chloroform.
  • a coupling agent such as EDC, HATU, DCC, EEDQ, CDI, pivaloyl chloride or diethylphosphorylcyanide is then added, optionally in the presence of a base, such as TEA or pyridine, and an optional adjuvant, such as HOBT or HOAT.
  • the coupling is typically effected at a temperature of between about 0°C and about 50° C, for a suitable time, such as from about one hour and about 24 hours, for example about 16 hours.
  • the compounds of formula (II) are prepared by reductive amination of a protected ketone (V); prepared as described hereinbelow in Scheme 4, with an appropriately-substituted heterocycloalkylamine (VI).
  • Such amination reactions are well-known to one skilled in the art. See, for example, A.F. Abdel-Magid, et al., J. Org. Chem., 61, 3849 (1996 ); R.F. Borch, et al., J. Am. Chem. Soc., 93, 2897 (1971 ); and S. Bhattacharyya, et al., Synlett, 1079 (1995 ).
  • the formula (VI) amines are well-known in the relevant art and may be obtained commercially or prepared by known methods. See, for example, D.A. Horton, et al., Chem. Rev., 103,893-930 (2003 ), H. Fukui, et al, Heterocycles, 56, 257-264 (2002 ), M.Y. Chu-Moyer, et al., J. Org. Chem., 60, 5721-5725 (1995 ), and J.P. Yevich, et al., J. Med. Chem., 29, 359-369 (1986 ).
  • (V) and (VI) are condensed in the presence of a reducing agent such as sodium borohydride, sodium cyanoborohydride, sodium triacetoxyborohydride, tetramethylammonium triacetoxyborohydride, or hydrogen in the presence of a catalyst (10% Pd/C, platinum oxide, etc.), optionally in the presence of an acid (e.g . acetic acid (AcOH), hydrochloric acid, etc.).
  • a reaction-inert solvent such as 1,2-dichloroethane, THF, DMF, EtOH, or MeOH.
  • the reaction is performed at a suitable temperature, such as 0 to 50°C, for a suitable period of time, such as between about one to about 24 hours, for example, about 16 hours.
  • the compounds of formula (V) may be prepared as described hereinbelow in Scheme 4, beginning with, as appropriate, commercially available carboxylic acid (VII), ketocarboxylic acid (IX), or ketoester (X) .
  • Step 1 protected acid (VII) is coupled with amine (IV) as described hereinabove in Scheme 2 to afford alcohol (VIII).
  • alcohol (VIII) is oxidized to ketone (Va) by treating (VIII) with an oxidizing agent in a reaction-inert solvent.
  • oxidizing agents comprise pyridine/sulfur trioxide in DMSO; aqueous sodium hypochlorite in the presence of sodium bromide and TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) free radical catalyst; chromium based reagents, such as chromium trioxide, pyridinium dichromate, or pyridinium chlorochromate; and oxalyl chloride in DMSO in the presence of a tertiary amine.
  • reaction-inert solvents comprise dichloromethane, EtOAc, toluene, or pyridine.
  • the oxidation is typically conducted at a temperature of between about -78°C and about 50°C, for between about one and about 24 hours, for example, about 16 hours.
  • Such oxidations are well-known to one skilled in the art. See, for example, M. Tamaki, et al., J. Org. Chem., 66, 3593 (2001 ) and X-I. Qiu, et al., J. Org. Chem., 67, 7162 (2002 ).
  • Step 3 protected ketocarboxylic acid (IX) is first coupled with amine (IV), as described hereinabove in Scheme 2, to afford (Va), which is then alkylated to afford ketone (V).
  • the alkylation is typically effected by first forming an enamine by reacting ketone (Va) with a secondary amine, for example, pyrrolidine, piperidine or morpholine, followed by treatment with an alkylating agent, optionally in the presence of a base, such as potassium carbonate.
  • a base such as potassium carbonate.
  • the reaction is effected in a solvent such as benzene, toluene, acetonitrile, or dioxane.
  • solvent such as benzene, toluene, acetonitrile, or dioxane.
  • Step 6 ketoester (XI) is saponified to yield the corresponding carboxylic acid which, in Step 7, is coupled with an appropriately-substituted amine (IV), as previously described hereinabove in Scheme 2.
  • the saponification step is typically accomplished by dissolving (XI) in a water-miscible solvent, such as MeOH or EtOH, and water in the presence of a base, such as lithium hydroxide or sodium hydroxide.
  • the saponification is effected at suitable temperature, such as between about 0 °C and about 100°C, preferably room temperature, for a suitable time, such as between about one and about 24 hours, for example, about 16 hours.
  • a pharmaceutical composition of the present invention comprises a therapeutically effective amount of a compound of Formula (IA), or a pharmaceutically acceptable salt of the compound, and a pharmaceutically acceptable carrier, vehicle, diluent or excipient.
  • a pharmaceutical composition of the present invention comprises a therapeutically effective amount of the compound (3,3-difluoropyrrolidin-1-yl)-((2S,4S)-4-(4-(pyrimidin-2-yl)piperazin-1-yl)pyrrolidin-2-yl)methanone, or a pharmaceutically acceptable salt of said compound; and a pharmaceutically acceptable carrier, vehicle, diluent or excipient.
  • compositions formed by combining the compounds of this invention and the pharmaceutically acceptable carriers, vehicles or diluents are then readily administered in a variety of dosage forms such as tablets, powders, lozenges, syrups, injectable solutions and the like.
  • These pharmaceutical compositions can, if desired, contain additional ingredients such as flavorings, binders, excipients and the like.
  • tablets containing various excipients such as sodium citrate, calcium carbonate and/or calcium phosphate
  • various disintegrants such as starch, alginic acid and/or certain complex silicates, together with binding agents such as polyvinylpyrrolidone, sucrose, gelatin and/or acacia.
  • binding agents such as polyvinylpyrrolidone, sucrose, gelatin and/or acacia.
  • lubricating agents such as magnesium stearate, sodium lauryl sulfate and talc are often useful for tabletting purposes.
  • Solid compositions of a similar type may also be employed as fillers in soft and hard filled gelatin capsules. Preferred materials for this include lactose or milk sugar and high molecular weight polyethylene glycols.
  • the active pharmaceutical agent therein may be combined with various sweetening or flavoring agents, coloring matter or dyes and, if desired, emulsifying or suspending agents, together with diluents such as water, ethanol, propylene glycol, glycerin and/or combinations, thereof.
  • solutions of the compounds or compositions of this invention in sesame or peanut oil, aqueous propylene glycol, or in sterile aqueous solutions may be employed.
  • aqueous solutions should be suitably buffered if necessary and the liquid diluent first rendered isotonic with sufficient saline or glucose.
  • aqueous solutions are especially suitable for intravenous, intramuscular, subcutaneous and intraperitoneal administration.
  • the sterile aqueous media employed are all readily available by standard techniques known to those skilled in the art.
  • the compounds or compositions of the invention are conveniently delivered in the form of a solution or suspension from a pump spray container that is squeezed or pumped by the patient or as an aerosol spray presentation from a pressurized container or a nebulizer, with the use of a suitable propellant, e.g ., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas.
  • a suitable propellant e.g ., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoroethane, carbon dioxide or other suitable gas.
  • the dosage unit may be determined by providing a valve to deliver a metered amount.
  • the pressurized container or nebulizer may contain a solution or suspension of a compound of this invention.
  • Capsules and cartridges for use in an inhaler or insufflator may be formulated containing a powder mix of a compound or compounds of the invention and a suitable powder base such as lactose or starch.
  • the invention is directed to a pharmaceutical composition, which comprises a therapeutically effective amount of a compound of the invention or a pharmaceutically acceptable salt of the compound; a second compound that is an antidiabetic agent selected from insulin and insulin analogs; insulinotropin; biguanides; ⁇ 2 -antagonists and imidazolines; glitazones; aldose reductase inhibitors; glycogen phosphorylase inhibitors; sorbitol dehydrogenase inhibitors; fatty acid oxidation inhibitors; ⁇ -glucosidase inhibitors; ⁇ -agonists; phosphodiesterase inhibitors; lipid-lowering agents; antiobesity agents; vanadate and vanadium complexes and peroxovanadium complexes; amylin antagonists; glucagon antagonists; growth hormone secretagogues; gluconeogenesis inhibitors; somatostatin analogs; antilipolytic agents; a prodrug of the antidiabetic agents, or a pharmaceutical
  • the invention is directed to a kit comprising: a first dosage form comprising a compound of the invention, or a pharmaceutically acceptable salt of the compound; and a second dosage form comprising an antidiabetic agent selected from insulin and insulin analogs; insulinotropin; biguanides; ⁇ 2 -antagonists and imidazolines; glitazones; aldose reductase inhibitors; glycogen phosphorylase inhibitors; sorbitol dehydrogenase inhibitors; fatty acid oxidation inhibitors; ⁇ -glucosidase inhibitors; ⁇ -agonists; phosphodiesterase inhibitors; lipid-lowering agents; antiobesity agents; vanadate and vanadium complexes and peroxovanadium complexes; amylin antagonists; glucagon antagonists; growth hormone secretagogues; gluconeogenesis inhibitors; somatostatin analogs; antilipolytic agents; prodrugs of the antidiabetic agents, or a pharmaceutical
  • the invention is directed to a method of identifying an insulin secretagogue agent for diabetes, comprising: administering an agent of the invention to a fasted, diabetic KK/H1J symptomatic mouse; and assessing a response in the mouse to a subsequent oral glucose challenge, wherein, if said mouse demonstrates an improvement in the symptoms, said agent is identified as a treatment for Type 2 diabetes, Type 1 diabetes, impaired glucose tolerance, hyperglycemia, metabolic syndrome (syndrome X and/or insulin resistance syndrome), glucosuria, metabolic acidosis, arthritis, cataracts, diabetic neuropathy, diabetic nephropathy, diabetic retinopathy, diabetic cardiomyopathy, obesity, conditions exacerbated by obesity, hypertension, hyperlipidemia, atherosclerosis, osteoporosis, osteopenia, frailty, bone loss, bone fracture, acute coronary syndrome, short stature due to growth hormone deficiency, infertility due to polycystic ovary syndrome, anxiety, depression, insomnia,
  • an effective dosage for the compounds of the present invention is in the range of 0.01mg/kglday to 30 mg/kg/day, preferably 0.01 mg/kg/day to 5 mg/kg/day of active compound in single or divided doses. Some variation in dosage will necessarily occur, however, depending on the condition of the subject being treated. The individual responsible for dosing will, in any event, determine the appropriate dose for the individual subject. Practitioners will appreciate that "kg” refers to the weight of the patient measured in kilograms.
  • the compounds or compositions of this invention may be administered in single ( e.g ., once daily) or multiple doses or via constant infusion.
  • the compounds of this invention may also be administered alone or in combination with pharmaceutically acceptable carriers, vehicles or diluents, in either single or multiple doses.
  • suitable pharmaceutical carriers, vehicles and diluents include inert solid diluents or fillers, sterile aqueous solutions and various organic solvents.
  • compositions of the present invention may be administered to a subject in need of treatment by a variety of conventional routes of administration, including orally and parenterally, (e.g. , intravenously, subcutaneously or intramedullary). Further, the pharmaceutical compositions of this invention may be administered intranasally, as a suppository, or using a "flash" formulation, i.e ., allowing the medication to dissolve in the mouth without the need to use water.
  • tert -butyl-(2 S )-2-[(3,3-difluoropyrrolidin-1-yl)carbonyl]-4-oxopyrrolidine-1-carboxylate may be prepared according to the following procedure.
  • Step 1 tert -Butyl (2 S ,4 R )-2- ⁇ [(3 R *,4 S *)-3,4difluoropyrrolidin-1-yl]carbonyl]-4-hydroxypyrrolidine-1-carboxylate
  • Step 1 The product of Step 1 (1.97 g, 6.15 mmol) was oxidized in a manner analogous to that described in . Preparation 1, Step 2, to afford 0.74 g (38%) of the title compound as a light yellow solid. MS m/z 319 (MH + ).
  • 3-Pyrroline (10 g, 0.145 mol) was added to a slurry of sodium bicarbonate (14 g, 0.17 mol) in toluene (100 mL). The mixture was cooled to 0°C and benzyl chloroformate (23 mL, 0.16 mol) was added dropwise. After stirring overnight the solution was diluted with dichloromethane, washed with cold water and brine, dried over magnesium sulfate, and concentrated to a pale yellow oil that was distilled in vacuo. Bp 119-126°C (0.32 mm).
  • Step 1 The title compound of Step 1 (3.0 g, 15 mmol) was dissolved in a mixture of acetonitrile (100 mL) and water (70 mL) containing ethylenediamine tetraacetate, disodium salt dihydrate (11 mg, 0.03 mmol). The solution was cooled to 0°C and 1,1,1-trifluoroacatone (14.5 mL, 160 mmol) was added over 10 min. Potassium peroxymonosulfate (45 g, 74 mmol) was added portionwise over 40 min while maintaining the pH at 7 by adding sodium bicarbonate. The mixture was stirred at 0°C for 1.5 hr then poured into water and extracted with dichloromethane. The combined extracts were dried over magnesium sulfate and concentrated to a colorless oil (3.45 g; 100%).
  • Step 4 (3 R ,4 S )- rel -3,4-Difluoro-pyrrolidine-1-carboxylic acid benzyl ester
  • N- tert -Boc-4-oxo-L-proline 917 mg, 4 mmol
  • the title compound of Step 2 (446 mg, 4 mmol)
  • HATU 1.673 g, 4.4 mmol
  • the reaction mixture was allowed to warm to RT and stirred overnight. Saturated sodium bicarbonate was added, the phases were separated and the aqueous phase was extracted with methylene chloride. The combined organic portions were washed with brine and dried over magnesium sulfate.
  • Step) 1 4-[(3 S ,5 S )-1-tert-Butoxycarbonyl-5-(3,3-difluoro-pyrrolidine-1-yl-pyrrolidin-3-yl]-piperazine-1-carboxylic acid benzyl ester
  • Step 1 The product of Step 1 (1g, 1.91 mmol) was dissolved in EtOH (50 mL) and 10% Pd/C (1g, 1 equiv. w/w) was carefully added, followed by 1,4-cyclohexadiene (1.81 mL, 10 equiv.). The mixture was stirred gently in a tightly-capped flask at RT overnight The reaction mixture was filtered through diatomaceous earth and concentrated to give the product as yellow semisolid (758 mg, 100%). MS m/z 389.4 (MH + ).
  • N- tert -BOC-4-oxo-L-proline (458 mg, 2 mmol), 3,3-difluoroazetidine hydrochloride (258 mg, 2 mmol)(prepared as described in WO 2000/47582 ), and DIPEA (0.35 mL, 2 mmol) were mixed in anhydrous methylene chloride (10 mL) and cooled to 0°C.
  • HOBT (405 mg, 3 mmol) was then added in one portion followed by EDC hydrochloride (422 mg, 2.2 mmol). The resulting mixture was allowed to warm to RT and stirred overnight. Saturated sodium bicarbonate was added, the organic layer was separated, and the aqueous phase extracted with methylene chloride.
  • Step 1 (2 S ,4 S )-4-Fluoro-pyrrolidine-1,2-dicarboxylic acid 2- tert -butyl ester 1-(2,5-dioxo-pyrrolidin-1-yl) ester
  • N- tert -BOC-cis-4-fluoro-L-proline 700 mg, 3 mmol
  • anhydrous DMF 8 mL
  • N-hydroxysuccinimide 380 mg, 3.3 mmol
  • 1,3-diisopropylcarbodiimide 391 mg, 3.1 mmol
  • Step 2 (2 S ,4 S )-2-Carbamoyl-4-fluoro-pyrrolidine-1-carboxylic acid tert -butyl, ester
  • Step 3 (2 S ,4 S )-2-Cyano-4-fluoro-pyrrolidine-1-carboxylic acid tert -butyl ester
  • the compounds of formula (I), the stereoisomers thereof, and the pharmaceutically acceptable salts of the compounds and stereoisomers may be prepared as described in the following Examples.
  • the free base compounds of the present invention may be obtained from their salt forms by conventional means such as disclosed in Example 113, herein.
  • Step 1 tert -Butyl (2 S ,4 S )-2-[(3,3-difluoropyrrolidin-1-yl)carbonyl]-4- ⁇ 4-[3-(trifluoromethyl) phenyl]piperazin-1-yl ⁇ pyrrolidine-1-carboxylate
  • Step 1 The product of Step 1 (120 mg, 0.225 mmol) was treated with 4N HCl in dioxane (5 mL). After two hr at RT, the mixture was concentrated to dryness, triturated with ether, filtered, and dried in vacuo to provide 92 mg of the title compound as a white solid. MS m/z 433 (MH + ).
  • Step 1 ( S )-2-(3,3-Difluoro-pyrrrolidine-1-carbonyl)-4-oxo-pyrrolidine-1-carboxylic acid tert-butyl ester
  • reaction mixture was sampled for completion by HPLC (using diethylamine to derivatize) after held for 1 hour at 0°C to 5°C.
  • 3,3-Difluoro-pyrrolidine hydrochloride (4.13 kg, 1.0 equivalent) was charged to the above mixture over 10 minutes at -10°C to 0°C.
  • Triethylamine (4.0 liters, 1.0 equiv) was introduced slowly over 70 minutes at -10°C to 0°C.
  • the mixture was stirred for 1h at 0 to 5°C.
  • the reaction was complete by HPLC assay ( ⁇ 1% starting material). The reaction was quenched with water (10 volumes) at 0°C to 5 °C.
  • the mixture was heated to 20°C to 25°C. The layers were separated, and the organic layer was washed with 0.5 M HCl (5 volumes). The organic layer was again washed with combined 5% NaHCO 3 (2 volumes) and half saturated brine solution (1.64 M, 3 volumes). The organic solution was concentrated atmospherically to a low stirrable volume (approximately 20 liters). Ethyl acetate (12.6 volumes, 82.8 liters) was added, the solution was concentrated atmospherically to -6 volumes. The mixture was held at 60°C to 65°C for 2 hours and cooled to room temperature over 3 hours. The mixture was held at 20°C to 25 °C for 8 hours.
  • Step 2 (2 S ,4 S )-2-(3,3-Difluoro-pyrrolidine-1-carbonyl)-4-(4-pyrimidin-2-yl-piperazin-1-yl)-pyrrolidine-1-carboxylic acid tert-butyl ester
  • a reactor was charged with THF (20 volumes), 2-piperazin-1-yl-pyrimidine (2.17 kg, 1.05 equivalents) and the product from Step 1 (4.00 kg, 1.0 equivalent). The mixture was held at 20°C to 25°C until all material was dissolved over 30 minutes. Acetic acid (0.792 kg, 1.05 equivalents) as added. The mixture was stirred for 1 hour during which the reaction mixture turned to cloudy. The reaction mixture was refluxed for 30 minutes and then concentrated at 60°C to 70°C until a steady temperature of 66.9°C was observed in the overheads indicating complete removal of water from the system. More THF was added as necessary. At the end, THF was added to bring the total volume in the reactor to 15 volumes of the limit reagent.
  • the reaction mixture was cooled to -3°C to 7°C and sampled for complete formation of imine by HPLC (using sodium triacetoxyborohydride to reduce imine).
  • Sodium triacetoxyborohydride (5.33 kg, 2.0 equivalents) was added portion-wise to the suspension at -5°C to 15°C.
  • the reaction mixture was heated to 20°C to 25°C and held for 12 hours. HPLC results confirmed the reaction was complete by 99.8%.
  • Sodium bicarbonate aqueous solution (10% w/w, 10 volumes) was added.
  • the slurry was concentrated to remove 10 volumes of THF under partial vacuum at 30°C to 60°C.
  • Ethyl acetate (10 volumes) was added to the suspension after it cooled to 20°C to 25°C.
  • the organic phase was separated and the aqueous phase was checked by HPLC. It contained less than 2% of the product.
  • the organic phase was washed with water (5 volumes), saturated brine solution (5 volumes) and concentrated to a small volume (2 volumes) under partial vacuum at 45°C to 50°C.
  • To the slurry was added heptane (10 volumes) at 45°C to 50°C over 30 minutes. The mixture was cooled to 20°C to 25°C and granulated for 2 hours. Solid was collected by filtration, rinsed with heptane (2 volumes). Drying in a tray dryer for 12 hours at 35°C to 45°C yield 5.35 kg (91.3%) of the product.
  • Step 3 (3,3-Difluoro-pyrrolidin-1-yl)-[(2 S ,4 S )-4-(4-pyrimidin-2-yl-piperazin-1-yl)-pyrrolidin-2-yl]-methanone
  • the mixture was warmed to 20°C to 25°C and extracted with ethyl acetate twice (115 liters, 12 volumes and 57 liters, 6 volumes, respectively).
  • the sample from aqueous layer after second extraction was analyzed by HPLC and showed only 1% of the product in that aqueous solution.
  • the organic layers were combined and treated with magnesium sulfate (5 kg) for 1 hour.
  • the mixture was filtered.
  • the filter cake was rinsed with ethyl acetate (10 liters).
  • the filtrate was charged back to the reactor via a 0.2 micron in-line filter for speck free operation. (The following operations were performed under speck free conditions.)
  • the solution was concentrated to 20 liters (2 volumes) under partial vacuum at 50°C to 60°C.
  • the mixture was cooled to 20°C to 25°C over 30 minutes. Upon cooling to room temperature, crystallization occurred. The mixture was held for 30 minutes. Hexanes (20 liters, 2 volumes) was added slowly over 1 hour. The mixture was granulated for 2 hours. The solid product was collected by filtration and rinsed with hexanes/ethyl acetate (10 liters, 1:1 v/v). The filter was blown dry with nitrogen for a minimum of 2 hours. The product was dried in a tray dryer at 44°C for 12 hours. Yield: 5.7 kg, 75.9%. m.p. 156°C. MS m/z 367 (MH + ).
  • the dihydrochloride salt of the titled compound was prepared according to the method of Example 1.
  • the utility of the compounds of the invention, the prodrugs and stereoisomers thereof, and the pharmaceutically acceptable salts of the compounds, prodrugs, and stereoisomers, in the treatment or prevention of the conditions enumerated hereinabove in mammals may be demonstrated in conventional assays known to one of ordinary skill in the relevant art, including the in vivo and in vitro assays described below. Such assays also provide a means by which the activities of the compounds of the invention, the prodrugs, and stereoisomers thereof, and the pharmaceutically acceptable salts of the compounds, prodrugs, and stereoisomers, may be compared with the activities of other compounds.
  • DPP-IV inhibition may be demonstrated in vitro by the following assay, which is adapted from methods of Scharpe, et al., A. Clin. Chem., 2299 (1988 ) and Lodja, Z. Czechoslovak Medicine, 181 (1988 ).
  • 150 ⁇ L of an enzyme-substrate solution is pipetted into microtiter wells of a polystyrene 96-well plate, and maintained at 4°C.
  • the enzyme-substrate solution comprises 50 ⁇ M Gly-Pro-4-methoxy- ⁇ -naphthylamide hydrochloride in 50mM Tris assay buffer pH 7.3 containing 0.1M sodium chloride, 0.1% (v/v) Triton and 50 ⁇ U/mL DPP-IV (MP Biomedicals, Livermore, CA; DPP-IV 5 mU/mL stock). 5 ⁇ L per well of the compound of formula (I) is added, bringing the final concentrations of the formula (I) compound to between 3 ⁇ M and 10 nM per well. Controls . Enzyme is omitted from four (4) wells, as a reagent blank. 5 ⁇ L of 3 mM Diprotin A (Bachem
  • the entire assay is incubated overnight (between 14 and 18 hours) at 37 °C.
  • the reaction is quenched by adding 10 ⁇ L of Fast Blue B solution (0.5 mg/mL Fast Blue B in a buffer comprising 0.1 M sodium acetate pH 4.2 and 10% (v/v) Triton X-100 to each well, followed by shaking for approximately 5 min at room temperature.
  • the plates may be analyzed on a Spectramax spectrophotometer (Molecular Devices; Sunnyvale, CA), or equivalent equipment, (absorption maximum at 525 nm).
  • IC 50 data for compounds may be obtained by measuring the activity of DPP-IV over a range of compound concentrations from 10nM to 3 ⁇ M.
  • DPP-IV inhibitors including the compounds of formula (I) may be exemplified in 4-6 week old KK/H1J mice (Jackson Labs; Bar Harbor, ME) in the context of an oral glucose tolerance test.
  • Oral glucose tolerance tests have been in use in humans since, at least, the 1930s, as described by Pincus, et al., Am. J. Med. Sci., 782 (1934 ), and are routinely used in the diagnosis of human diabetes, though not to evaluate the efficacy of therapeutic agents in patients.
  • KK mice have been used to evaluate (i) glitazones ( Fujita et al. Diabetes, 804 (1983 ); Fujiwara, et al., Diabetes, 1549 (1988 ); and Izumi, et al., Biopharm Drug. Dispos., 247 (1997 )); (ii) metformin ( Reddi, et al., Diabet. Metabol., 44 (1993 )); (iii) glucosidase inhibitors ( Hamada, et al., Jap. Pharmacol. Ther., 17 (1988 ) and Matsuo, et al., Am. J. Clin.
  • KK mice are derived from an inbred line first established and described by Kondo, et al., Bull. Exp. Anim., 107 (1957 ). These mice spontaneously develop a hereditary form of polygenic diabetes that progresses to cause renal, retinal, and neurological complications analogous to those seen in human diabetic subjects, however, they do not require insulin or other medication for survival.
  • Another aspect of the invention is directed to the use of KK mice to evaluate the effects of insulin secretagogue agents in the context of an oral glucose tolerance test.
  • the mice (10 per group) are then orally dosed with a solution of a compound of formula (I) in 0.5% methylcellulose (0.2 mL/mouse). Two controls groups receive only 0.5% methylcellulose.
  • mice are bled, as described above, and then dosed with 1 mg/kg glucose in distilled water (0.2 mL/mouse).
  • the first control group is dosed with glucose.
  • the second control group is dosed with water.
  • the mice are again bled, as described above.
  • the blood samples are centrifuged, the plasma collected and analyzed for glucose content on a Roche-Hitachi 912 glucose analyzer (Roche Diagnostics Corp.; Indianapolis, IN). The data may be expressed as percent (%) inhibition of glucose excursion relative to the two control groups (i.e. , the glucose level in the animals receiving glucose but no test compound representing 0% inhibition and the glucose concentration in the animals receiving only-water representing 100% inhibition).
  • the compounds of formula (I) generally exhibit inhibitory activity, expressed as IC 50 's, against DPP-IV that are ⁇ 1,000 nM. Generally preferred compounds have IC 50 's ⁇ 100 nM.
  • IC 50 's ⁇ 100 nM.
  • ((2S,4S)-4-(4-(3-cyanopyrazin-2-yl)piperazin-1-yl)pyrrolidin-2-yl)-((3 R *,4 S *)-3,4-difluoropyrrolidin-1-yl)-methanone dihydrochloride has an IC 50 of 3.5 nM.
  • mice male Sprague-Dawley rats (200-250 grams) implanted with jugular vein cannulas (JVC) were obtained from Charles River Laboratories. Each compound was administered to two rats or by oral gavage. The oral dose was administered as a solution in 0.5% methycellulose with a dose volume of 10 mL/kg. The amount of each compound administered was 5 mg/kg body weight.
  • Blood samples (0.25mL) were collected at multiple time points from 0-24 hours and placed into tubes containing lithium heparin (Becton Dickinson, Microtainer ® ). The blood samples were then centrifuged at 12000 rpm for 10 minutes). Plasma aliquots were taken for determination of compound plasma concentrations (pharmacokinetic analysis). The plasma samples were frozen at -70°C until analysis.
  • rat plasma samples were analyzed for compound concentrations by LC/MS/MS (Applied Biosystems API 4000 mass spectrometer).
  • compound standard curves were prepared in control rat plasma with a dynamic range of 1.0-2000 ng/mL. Aliquots (0.02mL) of both standards and samples were placed into Marsh TM tubes in a 96-well block. Proteins were precipitated by addition of 0.1mL acetonitrile containing 0.1 ⁇ g/mL of internal standard. The 96-well blocks were vortexed and then centrifuged at 3000rpm for 5 minutes. The resulting supernatant was removed and placed into a new 96-well block and taken to dryness at 50°C under a nitrogen stream. Residues were reconstituted in mobile phase (60% 5mM ammonium acetate and 40% acetonitrile). Aliquots (0.01mL) were then injected onto the LC/MS/MS for analysis.
  • the average plasma concentrations, measured are provided in the following table.
  • Compound/ Time (hr) CPD 113 Mean Plasma Level ng/ml Std dev Comparator Mean Plasma Level ng/ml Std dev 0.25 1406.0 338.0 446 71.1 0.5 1322.5 359.9 425 108 0.75 979.2 137.0 319 59.8 1 768.2 314.0 283 13.3 2 289.2 71.8 128 40.4 4 97.8 69.2 27.3 11.2 6 49.3 19.1 12.7 1.2 8 32.8 25.5 6.16 2.62
  • CPD 113 achieved and maintained significantly higher plasma concentrations than did the comparator compound

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